Rotary pump



April 11, 1944. 0. s; JOHNSON ROTARY PUMP Filed Feb. 3; 1943 2 Sheets-Sheet 1 I Inventor O/af Jlwerm 4421,9011

W MAW April 11, 1 4 Q. s. JOHNSON 2,346,218

ROTARY PUMP Filed Feb. 3, 1943 2 Sheets-Sheet 2 Patented Apr. 11, 1944 ROTARY PUMP I v Olaf Severen Johnson, Gloucester-City,l\l. J. Applicationl ebruai'y a, 1943-, Serial 47 1,5211 A 1 Claim? (01. ice-1st) l Myinvention relates to improvements in pumps of the rotary type;

The invention is designed with the particular purpose in view of providing a compact, simply I constructed, positive acting pump in which all springs, diaphragms, and valves are eliminated and which is adapted for maximum capacity output and high speed operation.

To the accomplishment of the above, and subordinate objects presently appearing, a preferred embodiment of my invention has been illustrated in the accompanying drawings, set forth in detail in the succeeding description and defined in the claim appended hereto.

In said drawings:

Figure 1 is a view in front elevation of the preferred embodiment of my invention with the cap plate removed to show the interior mecha- IllSm,

Figure 2 is a view in vertical section taken on the line 22 of Figure 1 looking in the direction indicated by the arrows.

Figure 3 is a view in perspective of the casing and rotor disassembled.

Figure 4 is a view in transverse section of the piston with the cross head shown in elevation, and

Figure 5 is a view in perspective of said piston.

Referring to the drawings by numerals, the illustrated embodiment of my invention comprises a. cylindrical casing I having a suitable base flange 2, a closed back 3, and an open front adapted to be closed by a cover plate 4 bolted thereto, as at 5. The casing I is provided with a pair of diametrically opposite inlet and outlet ports 6, 1 and internally threaded bosses 8 for connection of supply and discharge lines, not shown, to said ports, respectively. The ports 6 and 'l communicate with arcuate circumferentially extending intake and discharge pockets 9 and I0, respectively, in the inner wall of the casing l. The back 3 is provided with an outwardly extending, axial, sleeve bearing H, bushed, as at I2, for a rotor shaft l3, equipped on the inner end thereof with a rotor l4 integral therewith.

The rotor I4 has a revolving fit in the casing I and between the back 3 and plate 4 and comprises a disc-like head [5, a laterally extending edge flange [6, of segmental form, and diametrically opposite said flange a laterally extending edge boss I? having a recess l8 therein in the diametrical center of the rotor opening inwardly of the latter. The outer faces of the flange l6 and the boss l1 aref concentric to the inner wall of the casing I andhave aworking f t against the same. Astud l9 extends laterally from the head I5 eccentrically of the axis of rotation thereof into the recess [8 centrally of the latter and adjacent the bottom of the same for' a purpose presently seen. The inner faces of the flange l6 and boss i! are formed in the arc of a circle concentric to the axis of the stud iii to provide arcuate opposed guides 20,- 2l extending from side to side of therotor l4.

Fitting between said guides, 20, 2|, with a Work ing fit, for oscillation from side to side of the rotor M is an arcuate head 22 of a T-shaped piston 23 including a stem, or shank, 24, apertured, as at 25, to receive the stud l9 upon which said piston oscillates. The sides 26 of the piston head 22 are formed in the radius of the inner Wall of the casing I to alternately engage and fit against the same with a sealing contact under oscillation of said piston in opposite directions. The piston head 22 is of the proper thickness for a working fit between the head l5 of the rotor I 4 and the cover plate i.

Oscillating movement of the piston 23 is imparted thereto, under rotation of the rotor I l, by means of the following. The piston head 22 and stem 24 are provided axially of the latter with an inwardly extending guideway 21 for a block-like cross head 28 slidably fitted therein, and said stem 24 is slotted, as at 29, longitudinally in the outer face thereof in registration with said guideway 21. A stud 30 extends inwardly from the cover plate 4 in the vertical center of the casing l eccentrically of the common axis of rotation of the rotor M and piston 23, said stud extending through the stem 24 of piston 23 by way of the slot 29, the cross head 2% being journaled on said stud. As clearly shown in Figures 1 and 2 the stud 30 is located above said common axis of rotation of the rotor l4 and piston 23. As shown in Figure 1, the rotor i l and piston 28 have a full cycle position in which the flange I4 and boss I? are in angular relation to the transverse diametrical center of the casing I and clear the inlet and discharge ports 5 and l, and the axis of oscilla tion of the piston 23. i. e., the stud I9, is in 90 relation to the transverse diametrical center of said casing, whereby due to the described arrangement of the stud 30 relative to the common axis of rotation of the rotor l4 and piston 23, the piston 23 is in an intermediate position with its sides 26 spaced from the inner wall of the casing I. Manifestly, under rotation of the rotor l4 and piston 23, for instance, in the direction indicated by the arrow, the stud l9 will be caused to revolve eccentrically around the stud 30 there by causing the cross head 28, in cooperation with the guideway 21, to cause the piston to oscillate once during each cycle of operation of said rotor and alternately engage its sides 26 with the inner wall of said casing. As will be obvious, oscillation of the piston 23 is timed to engage the sides 26 thereof wipingly with said inner wall in quarter cycle positions of the rotor I4 so as to create a suction on the intake side of the casing and set up compression on the other side of said casing thereby drawing in water from the inlet port 6 and pocket 9 and into the space between the guides 20 and M and ejecting such water out of the same into the discharge pocket Ill and port 1. Under the described operation, the described fit between the piston 23 and guides 20, 2| provides for a seal between the piston 23 and rotor 14 and the fit of the flange l6 and boss (1 against the casing [a seal between the rotor and casing all contributing to maximum pumping efficiency and positive pumping action.

Obviously, operation of the pump, as described, may be reversed if desired.

The foregoing will, it is believed, suffice to impart a clear understanding: of my invention without further explanation.

Manifestly the invention, as described, is susceptible of modification without departing from the inventive concept and right in herein reserved to such modifications as fall within the scope of the subjoined claim.

What I claim is:

In a pump of the class described, a cylindrical casing having a pair of diametrically opposite intake and discharge ports, respectively, therein, a rotor having a working fit in said casing an arcuate guideway extending therethrough from side to side thereof, and a radial recess therein extending from said guideway, an elongated arcuate piston shorter than said guideway mounted therein for rotation by said rotor about the axis of the latter and for oscillation to create a suction in the casing on the intake side thereof and compression on the discharge side, means to oscillate said piston under rotation of said rotor, comprising a radial shank on said piston extending into said recess andpivoted to said rotor eccentrically of the axis of rotation of the latter, a stud extending from said casing parallel with said axis of rotation and eccentrically thereof, and a sliding connection between said stud and piston, said connection comprising a cross head journaled on said-stud, said piston and shank having a guideway therein extending radially of the piston and in which said cross head is slidably mounted.

OLAF SEVEREN JOHNSON, 

